fix displaying add field button with turbo

app/components/types_de_champ_editor/editor_component/editor_component.html.haml

@@ -1,6 +1,7 @@
-.fr-container.fr-pb-12w
-  .types-de-champ-editor.editor-root{ 'data-turbo': 'true', id: dom_id(@revision, :types_de_champ_editor) }
+.fr-container.fr-pb-12w{ 'data-turbo': 'true', id: dom_id(@revision, :types_de_champ_editor) }
+  .types-de-champ-editor.editor-root
     = render TypesDeChampEditor::ErrorsSummary.new(revision: @revision)
     = render TypesDeChampEditor::BlockComponent.new(block: @revision, coordinates: coordinates)
   - if coordinates.empty?
-    = render TypesDeChampEditor::AddChampButtonComponent.new(revision: @revision, is_annotation: annotations?)
+    #empty-coordinates
+      = render TypesDeChampEditor::AddChampButtonComponent.new(revision: @revision, is_annotation: annotations?)

app/views/administrateurs/types_de_champ/_insert.turbo_stream.haml

@@ -9,6 +9,9 @@
 - if @destroyed.present?
   = turbo_stream.remove dom_id(@destroyed, :type_de_champ_editor)
 
+  - if @destroyed.siblings.empty?
+    = turbo_stream.show('empty-coordinates')
+
 - if @created.present?
   - if @created.coordinate.previous_sibling.present?
     = turbo_stream.after dom_id(@created.coordinate.previous_sibling, :type_de_champ_editor) do
@@ -17,6 +20,8 @@
     = turbo_stream.prepend dom_id(@created.coordinate.block, :types_de_champ_editor_block) do
       - render @created
 
+  = turbo_stream.hide('empty-coordinates')
+
 - @morphed&.each do |champ_component|
   = turbo_stream.replace dom_id(champ_component.coordinate, :type_de_champ_editor) do
     - render champ_component